decision device in BASK receiver

I'm designing decision device in BASK receiver and i have total no. of symbols ns=3000 and divided into total number of bits (tnb)=30 and each bit contains (nsb=100) samples.. i want to make nested for loops that add each 100 sample in each bit and divide it by the total no. of samples (nsb) to get average, if the sum greater than 0.5 then the output is 1 else 0 !!! i made the following code but it's wrong

for w=1:nsb:ns
  summ=0;

    for g=1:nsb
        summ= (summ+fds(g))/nsb

    if summ <= 0.5
        bitout=0;
    else
        bitout=1;

    end
    end
end

where fds is the output from the transmitter after the envelope detector

please could anyone help me with this code?? thanks,

Answer 1

[Walter Roberson]

I suspect that at the very least you want to move your "if" to after the "end" of the "for g". However, I have to been able to tell from your description what you are trying to do. For example, why calculate all those bitout values only to throw them away the next time you go through the loop?

[Salma]

i did a little modification in the code

%ns=3000

%nsb=100

%tnb=30

%fds= output from envelope detector

for w=1:nsb:ns

summ=0;

for g=1:nsb

summ= summ+fds(g);

end

tot= summ/nsb;

if summ <= 0.5

bitout=0

else

bitout=1

end

end

the problem is that in the second for loop it loops only from 1 to 100 (1:nsb) but it doesn't continue from 101 to 200, 201 to 300 and so on.. so do you have any idea how could i solve that??

[Walter Roberson]

for g = w:w+nsb-1

[Salma]

thanks it works perfectly :)